jdk8-mips64-public/hotspot: src/share/vm/gc_implementation/g1/heapRegionSets.cpp@58fc1b1523dc (annotated)

src/share/vm/gc_implementation/g1/heapRegionSets.cpp@58fc1b1523dc (annotated)

src/share/vm/gc_implementation/g1/heapRegionSets.cpp

Fri, 14 Mar 2014 10:15:46 +0100

author: brutisso
date: Fri, 14 Mar 2014 10:15:46 +0100
changeset 6385: 58fc1b1523dc
parent 3268: 8aae2050e83e
permissions: -rw-r--r--

8034079: G1: Refactor the HeapRegionSet hierarchy
Reviewed-by: tschatzl, pliden

 /*
  * Copyright (c) 2011, Oracle and/or its affiliates. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
  * under the terms of the GNU General Public License version 2 only, as
  * published by the Free Software Foundation.
  *
  * This code is distributed in the hope that it will be useful, but WITHOUT
  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  * version 2 for more details (a copy is included in the LICENSE file that
  * accompanied this code).
  *
  * You should have received a copy of the GNU General Public License version
  * 2 along with this work; if not, write to the Free Software Foundation,
  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  *
  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  * or visit www.oracle.com if you need additional information or have any
  * questions.
  *
  */
 #include "precompiled.hpp"
 #include "gc_implementation/g1/heapRegionRemSet.hpp"
 #include "gc_implementation/g1/heapRegionSet.hpp"
 // Note on the check_mt_safety() methods below:
 //
 // Verification of the "master" heap region sets / lists that are
 // maintained by G1CollectedHeap is always done during a STW pause and
 // by the VM thread at the start / end of the pause. The standard
 // verification methods all assert check_mt_safety(). This is
 // important as it ensures that verification is done without
 // concurrent updates taking place at the same time. It follows, that,
 // for the "master" heap region sets / lists, the check_mt_safety()
 // method should include the VM thread / STW case.
 void FreeRegionList::verify_list() {
   HeapRegion* curr = head();
   HeapRegion* prev1 = NULL;
   HeapRegion* prev0 = NULL;
   uint count = 0;
   size_t capacity = 0;
   while (curr != NULL) {
     verify_region(curr);
     count++;
     guarantee(count < _unrealistically_long_length,
         hrs_err_msg("[%s] the calculated length: %u seems very long, is there maybe a cycle? curr: "PTR_FORMAT" prev0: "PTR_FORMAT" " "prev1: "PTR_FORMAT" length: %u", name(), count, curr, prev0, prev1, length()));
     capacity += curr->capacity();
     prev1 = prev0;
     prev0 = curr;
     curr = curr->next();
   }
   guarantee(tail() == prev0, err_msg("Expected %s to end with %u but it ended with %u.", name(), tail()->hrs_index(), prev0->hrs_index()));
   guarantee(length() == count, err_msg("%s count mismatch. Expected %u, actual %u.", name(), length(), count));
   guarantee(total_capacity_bytes() == capacity, err_msg("%s capacity mismatch. Expected " SIZE_FORMAT ", actual " SIZE_FORMAT,
       name(), total_capacity_bytes(), capacity));
 }
 void MasterFreeRegionListMtSafeChecker::check() {
   // Master Free List MT safety protocol:
   // (a) If we're at a safepoint, operations on the master free list
   // should be invoked by either the VM thread (which will serialize
   // them) or by the GC workers while holding the
   // FreeList_lock.
   // (b) If we're not at a safepoint, operations on the master free
   // list should be invoked while holding the Heap_lock.
   if (SafepointSynchronize::is_at_safepoint()) {
     guarantee(Thread::current()->is_VM_thread() ||
               FreeList_lock->owned_by_self(), "master free list MT safety protocol at a safepoint");
   } else {
     guarantee(Heap_lock->owned_by_self(), "master free list MT safety protocol outside a safepoint");
   }
 }
 void SecondaryFreeRegionListMtSafeChecker::check() {
   // Secondary Free List MT safety protocol:
   // Operations on the secondary free list should always be invoked
   // while holding the SecondaryFreeList_lock.
   guarantee(SecondaryFreeList_lock->owned_by_self(), "secondary free list MT safety protocol");
 }
 void OldRegionSetMtSafeChecker::check() {
   // Master Old Set MT safety protocol:
   // (a) If we're at a safepoint, operations on the master old set
   // should be invoked:
   // - by the VM thread (which will serialize them), or
   // - by the GC workers while holding the FreeList_lock, if we're
   //   at a safepoint for an evacuation pause (this lock is taken
   //   anyway when an GC alloc region is retired so that a new one
   //   is allocated from the free list), or
   // - by the GC workers while holding the OldSets_lock, if we're at a
   //   safepoint for a cleanup pause.
   // (b) If we're not at a safepoint, operations on the master old set
   // should be invoked while holding the Heap_lock.
   if (SafepointSynchronize::is_at_safepoint()) {
     guarantee(Thread::current()->is_VM_thread()
         || FreeList_lock->owned_by_self() || OldSets_lock->owned_by_self(),
         "master old set MT safety protocol at a safepoint");
   } else {
     guarantee(Heap_lock->owned_by_self(), "master old set MT safety protocol outside a safepoint");
   }
 }
 void HumongousRegionSetMtSafeChecker::check() {
   // Humongous Set MT safety protocol:
   // (a) If we're at a safepoint, operations on the master humongous
   // set should be invoked by either the VM thread (which will
   // serialize them) or by the GC workers while holding the
   // OldSets_lock.
   // (b) If we're not at a safepoint, operations on the master
   // humongous set should be invoked while holding the Heap_lock.
   if (SafepointSynchronize::is_at_safepoint()) {
     guarantee(Thread::current()->is_VM_thread() ||
               OldSets_lock->owned_by_self(),
               "master humongous set MT safety protocol at a safepoint");
   } else {
     guarantee(Heap_lock->owned_by_self(),
               "master humongous set MT safety protocol outside a safepoint");
   }
 }

Mercurial > jdk8-mips64-public > hotspot / annotate

src/share/vm/gc_implementation/g1/heapRegionSets.cpp@58fc1b1523dc (annotated)

src/share/vm/gc_implementation/g1/heapRegionSets.cpp